Physics: Waves

Question 1

what do waves do

Answer 1

waves transfer energy

Question 2

what is amplitude

Answer 2

displacement from undisturbed position to crest

Question 3

what is wavelength

Answer 3

distance between the same point on two adjacent waves

Question 4

what is the trough

Answer 4

the turning point of the wave back up

Question 5

what is the crest

Answer 5

the peak of the wave where it comes back down

Question 6

describe a transverse wave

Answer 6

the oscillations are perpendicular to the direction of energy transfer

Question 7

describe a longitudinal wave

Answer 7

the oscillations are parallel to the direction of energy transfer

Question 8

what is the wave speed equation

Answer 8

v (wave speed) = f(frequency) x λ (wavelength)

Question 9

what three hings can all waves be

Answer 9

absorbed, transmitted, reflected

Question 10

what is the normal

Answer 10

imaginary line that is perpendicular to the surface of the object at the point of incidence

Question 11

what is the angle of incidence

Answer 11

angle between the incoming wave and the normal

Question 12

what is angle of reflection

Answer 12

angle between the reflected wave and the normal

Question 13

what is the angle rule

Answer 13

angle of incidence = angle of reflection

Question 14

what 4 things do all EM waves have incommon

Answer 14

All EM waves are transverse, emitted from one source then absorbed or reflected by another, travel at the speed of light, can travel through air or a vacuum

Question 15

what are the seven EM waves in ascending frequency

Answer 15

Radio Waves, Microwaves, Infrared, Visible light, Ultra Violet, X-Rays, Gamma Rays

Question 16

what are radio waves used for

Answer 16

Communication

Question 17

what are microwaves used for

Answer 17

satellite communication and cooking

Question 18

what are infrared waves used for

Answer 18

increase or monitor temperature

Question 19

what is visible light used for

Answer 19

transmit data in fibre optic cables

Question 20

what can UV waves do

Answer 20

give you a tan

Question 21

what are X-Rays and Gamma rays used for

Answer 21

radiography and medical tracers

Question 22

what is the risk of EM waves

Answer 22

The EM radiation can be harmful to people

Question 23

what are the two types of lenses

Answer 23

convex and concave

Question 24

what do convex lens do to rays

Answer 24

bend the light towards the normal

Question 25

what do concave lens do to rays

Answer 25

bend light away from the normal

Question 26

what two images can lenses produce

Answer 26

virtual and real

Question 27

what four other words can be used to describe an image

Answer 27

upright, inverted, magnified, diminished

Question 28

what is the magnification equation

Answer 28

magnification = image height / object height

Question 29

what do colour and transparency f visible light depend on

Answer 29

Absorbed wavelengths

Question 30

what does every object do (infrared radiation)

Answer 30

emit and absorb it

Question 31

what surface is the best emitter of infrared

Answer 31

matte black

Question 32

what surface is the best absorber of infrared

Answer 32

matte black

Question 33

what surface is the best reflecter of infrared

Answer 33

shiny white

Question 34

what type of wave is sound wave

Answer 34

longitudinal wave

Question 35

what causes sound waves

Answer 35

vibrating objects

Question 36

how does the ear work

Answer 36

the ear drum vibrates and passes these vibrations onto tiny bones called ossicles to the cochlea. The cochlea converts these vibrations into electrical signals and passes them onto the brain

Question 37

what frequency are sound waves

Answer 37

20Hz - 20000Hz

Question 38

what is ultrasound

Answer 38

sound wave with a frequency above 20000Hz

Question 39

what is ultrasound used for

Answer 39

viewing fetus in a pregnant women and destroying kidney stones